Substitutes in Non-Mechanical Heat Transfer Systems

Substitutes are reviewed on the basis of ozone
depletion potential, global warming potential, toxicity,
flammability, and exposure potential. Lists of acceptable
and unacceptable substitutes are updated several times
each year. A
chronological list of SNAP
updates is also available.

PFCs are
only allowed in new systems where a study has
demonstrated that no other alternatives are
technically feasible due to safety or performance
requirements; this study must be kept available for
review.